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Theorem noinfbnd1lem4 27786

Description: Lemma for noinfbnd1 27789. If 𝑈 is a prolongment of 𝑇 and in 𝐵, then (𝑈‘dom 𝑇) is not undefined. (Contributed by Scott Fenton, 9-Aug-2024.)

**Hypothesis**
Ref	Expression
noinfbnd1.1	⊢ 𝑇 = if(∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥, ((℩𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥) ∪ {⟨dom (℩𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥), 1_o⟩}), (𝑔 ∈ {𝑦 ∣ ∃𝑢 ∈ 𝐵 (𝑦 ∈ dom 𝑢 ∧ ∀𝑣 ∈ 𝐵 (¬ 𝑢 <s 𝑣 → (𝑢 ↾ suc 𝑦) = (𝑣 ↾ suc 𝑦)))} ↦ (℩𝑥∃𝑢 ∈ 𝐵 (𝑔 ∈ dom 𝑢 ∧ ∀𝑣 ∈ 𝐵 (¬ 𝑢 <s 𝑣 → (𝑢 ↾ suc 𝑔) = (𝑣 ↾ suc 𝑔)) ∧ (𝑢‘𝑔) = 𝑥))))

**Assertion**
Ref	Expression
noinfbnd1lem4	⊢ ((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) → (𝑈‘dom 𝑇) ≠ ∅)

Distinct variable groups: 𝐵,𝑔,𝑢,𝑣,𝑥,𝑦 𝑣,𝑈 𝑥,𝑢,𝑦 𝑔,𝑉 𝑥,𝑣,𝑦,𝑈 Allowed substitution hints: 𝑇(𝑥,𝑦,𝑣,𝑢,𝑔) 𝑈(𝑢,𝑔) 𝑉(𝑥,𝑦,𝑣,𝑢)

Proof of Theorem noinfbnd1lem4 Dummy variable 𝑤 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		simpl1 1190	. . . . . . . 8 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → ¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥)
2		simpl2 1191	. . . . . . . 8 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉))
3		simprl 771	. . . . . . . 8 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → 𝑤 ∈ 𝐵)
4		simpl3 1192	. . . . . . . . 9 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇))
5		simp2l 1198	. . . . . . . . . . . . 13 ⊢ ((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) → 𝐵 ⊆ No )
6	5	sselda 3995	. . . . . . . . . . . 12 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ 𝑤 ∈ 𝐵) → 𝑤 ∈ No )
7		simp3l 1200	. . . . . . . . . . . . . 14 ⊢ ((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) → 𝑈 ∈ 𝐵)
8	5, 7	sseldd 3996	. . . . . . . . . . . . 13 ⊢ ((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) → 𝑈 ∈ No )
9	8	adantr 480	. . . . . . . . . . . 12 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ 𝑤 ∈ 𝐵) → 𝑈 ∈ No )
10		sltso 27736	. . . . . . . . . . . . 13 ⊢ <s Or No
11		soasym 5629	. . . . . . . . . . . . 13 ⊢ (( <s Or No ∧ (𝑤 ∈ No ∧ 𝑈 ∈ No )) → (𝑤 <s 𝑈 → ¬ 𝑈 <s 𝑤))
12	10, 11	mpan 690	. . . . . . . . . . . 12 ⊢ ((𝑤 ∈ No ∧ 𝑈 ∈ No ) → (𝑤 <s 𝑈 → ¬ 𝑈 <s 𝑤))
13	6, 9, 12	syl2anc 584	. . . . . . . . . . 11 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ 𝑤 ∈ 𝐵) → (𝑤 <s 𝑈 → ¬ 𝑈 <s 𝑤))
14	13	impr 454	. . . . . . . . . 10 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → ¬ 𝑈 <s 𝑤)
15	3, 14	jca 511	. . . . . . . . 9 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑤 ∈ 𝐵 ∧ ¬ 𝑈 <s 𝑤))
16		noinfbnd1.1	. . . . . . . . . 10 ⊢ 𝑇 = if(∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥, ((℩𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥) ∪ {⟨dom (℩𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥), 1_o⟩}), (𝑔 ∈ {𝑦 ∣ ∃𝑢 ∈ 𝐵 (𝑦 ∈ dom 𝑢 ∧ ∀𝑣 ∈ 𝐵 (¬ 𝑢 <s 𝑣 → (𝑢 ↾ suc 𝑦) = (𝑣 ↾ suc 𝑦)))} ↦ (℩𝑥∃𝑢 ∈ 𝐵 (𝑔 ∈ dom 𝑢 ∧ ∀𝑣 ∈ 𝐵 (¬ 𝑢 <s 𝑣 → (𝑢 ↾ suc 𝑔) = (𝑣 ↾ suc 𝑔)) ∧ (𝑢‘𝑔) = 𝑥))))
17	16	noinfbnd1lem2 27784	. . . . . . . . 9 ⊢ ((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ ((𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇) ∧ (𝑤 ∈ 𝐵 ∧ ¬ 𝑈 <s 𝑤))) → (𝑤 ↾ dom 𝑇) = 𝑇)
18	1, 2, 4, 15, 17	syl112anc 1373	. . . . . . . 8 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑤 ↾ dom 𝑇) = 𝑇)
19	16	noinfbnd1lem3 27785	. . . . . . . 8 ⊢ ((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑤 ∈ 𝐵 ∧ (𝑤 ↾ dom 𝑇) = 𝑇)) → (𝑤‘dom 𝑇) ≠ 1_o)
20	1, 2, 3, 18, 19	syl112anc 1373	. . . . . . 7 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑤‘dom 𝑇) ≠ 1_o)
21	20	neneqd 2943	. . . . . 6 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → ¬ (𝑤‘dom 𝑇) = 1_o)
22	21	expr 456	. . . . 5 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ 𝑤 ∈ 𝐵) → (𝑤 <s 𝑈 → ¬ (𝑤‘dom 𝑇) = 1_o))
23		imnan 399	. . . . 5 ⊢ ((𝑤 <s 𝑈 → ¬ (𝑤‘dom 𝑇) = 1_o) ↔ ¬ (𝑤 <s 𝑈 ∧ (𝑤‘dom 𝑇) = 1_o))
24	22, 23	sylib 218	. . . 4 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ 𝑤 ∈ 𝐵) → ¬ (𝑤 <s 𝑈 ∧ (𝑤‘dom 𝑇) = 1_o))
25	24	nrexdv 3147	. . 3 ⊢ ((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) → ¬ ∃𝑤 ∈ 𝐵 (𝑤 <s 𝑈 ∧ (𝑤‘dom 𝑇) = 1_o))
26		breq2 5152	. . . . . . 7 ⊢ (𝑥 = 𝑈 → (𝑦 <s 𝑥 ↔ 𝑦 <s 𝑈))
27	26	rexbidv 3177	. . . . . 6 ⊢ (𝑥 = 𝑈 → (∃𝑦 ∈ 𝐵 𝑦 <s 𝑥 ↔ ∃𝑦 ∈ 𝐵 𝑦 <s 𝑈))
28		simpl1 1190	. . . . . . 7 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → ¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥)
29		dfral2 3097	. . . . . . . 8 ⊢ (∀𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 𝑦 <s 𝑥 ↔ ¬ ∃𝑥 ∈ 𝐵 ¬ ∃𝑦 ∈ 𝐵 𝑦 <s 𝑥)
30		ralnex 3070	. . . . . . . . 9 ⊢ (∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ↔ ¬ ∃𝑦 ∈ 𝐵 𝑦 <s 𝑥)
31	30	rexbii 3092	. . . . . . . 8 ⊢ (∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ↔ ∃𝑥 ∈ 𝐵 ¬ ∃𝑦 ∈ 𝐵 𝑦 <s 𝑥)
32	29, 31	xchbinxr 335	. . . . . . 7 ⊢ (∀𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 𝑦 <s 𝑥 ↔ ¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥)
33	28, 32	sylibr 234	. . . . . 6 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → ∀𝑥 ∈ 𝐵 ∃𝑦 ∈ 𝐵 𝑦 <s 𝑥)
34		simpl3l 1227	. . . . . 6 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → 𝑈 ∈ 𝐵)
35	27, 33, 34	rspcdva 3623	. . . . 5 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → ∃𝑦 ∈ 𝐵 𝑦 <s 𝑈)
36		breq1 5151	. . . . . 6 ⊢ (𝑦 = 𝑤 → (𝑦 <s 𝑈 ↔ 𝑤 <s 𝑈))
37	36	cbvrexvw 3236	. . . . 5 ⊢ (∃𝑦 ∈ 𝐵 𝑦 <s 𝑈 ↔ ∃𝑤 ∈ 𝐵 𝑤 <s 𝑈)
38	35, 37	sylib 218	. . . 4 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → ∃𝑤 ∈ 𝐵 𝑤 <s 𝑈)
39		simpl2l 1225	. . . . . . . . . 10 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → 𝐵 ⊆ No )
40	39	adantr 480	. . . . . . . . 9 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → 𝐵 ⊆ No )
41		simprl 771	. . . . . . . . 9 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → 𝑤 ∈ 𝐵)
42	40, 41	sseldd 3996	. . . . . . . 8 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → 𝑤 ∈ No )
43	34	adantr 480	. . . . . . . . 9 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → 𝑈 ∈ 𝐵)
44	40, 43	sseldd 3996	. . . . . . . 8 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → 𝑈 ∈ No )
45		simpl2 1191	. . . . . . . . . . 11 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉))
46	16	noinfno 27778	. . . . . . . . . . 11 ⊢ ((𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) → 𝑇 ∈ No )
47	45, 46	syl 17	. . . . . . . . . 10 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → 𝑇 ∈ No )
48	47	adantr 480	. . . . . . . . 9 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → 𝑇 ∈ No )
49		nodmon 27710	. . . . . . . . 9 ⊢ (𝑇 ∈ No → dom 𝑇 ∈ On)
50	48, 49	syl 17	. . . . . . . 8 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → dom 𝑇 ∈ On)
51		simpll1 1211	. . . . . . . . . 10 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → ¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥)
52		simpll2 1212	. . . . . . . . . 10 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉))
53		simpll3 1213	. . . . . . . . . 10 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇))
54		simprr 773	. . . . . . . . . . . 12 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → 𝑤 <s 𝑈)
55	42, 44, 12	syl2anc 584	. . . . . . . . . . . 12 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑤 <s 𝑈 → ¬ 𝑈 <s 𝑤))
56	54, 55	mpd 15	. . . . . . . . . . 11 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → ¬ 𝑈 <s 𝑤)
57	41, 56	jca 511	. . . . . . . . . 10 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑤 ∈ 𝐵 ∧ ¬ 𝑈 <s 𝑤))
58	51, 52, 53, 57, 17	syl112anc 1373	. . . . . . . . 9 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑤 ↾ dom 𝑇) = 𝑇)
59		simpl3r 1228	. . . . . . . . . 10 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → (𝑈 ↾ dom 𝑇) = 𝑇)
60	59	adantr 480	. . . . . . . . 9 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑈 ↾ dom 𝑇) = 𝑇)
61	58, 60	eqtr4d 2778	. . . . . . . 8 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑤 ↾ dom 𝑇) = (𝑈 ↾ dom 𝑇))
62		simplr 769	. . . . . . . 8 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑈‘dom 𝑇) = ∅)
63		nogt01o 27756	. . . . . . . 8 ⊢ (((𝑤 ∈ No ∧ 𝑈 ∈ No ∧ dom 𝑇 ∈ On) ∧ ((𝑤 ↾ dom 𝑇) = (𝑈 ↾ dom 𝑇) ∧ 𝑤 <s 𝑈) ∧ (𝑈‘dom 𝑇) = ∅) → (𝑤‘dom 𝑇) = 1_o)
64	42, 44, 50, 61, 54, 62, 63	syl321anc 1391	. . . . . . 7 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ (𝑤 ∈ 𝐵 ∧ 𝑤 <s 𝑈)) → (𝑤‘dom 𝑇) = 1_o)
65	64	expr 456	. . . . . 6 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ 𝑤 ∈ 𝐵) → (𝑤 <s 𝑈 → (𝑤‘dom 𝑇) = 1_o))
66	65	ancld 550	. . . . 5 ⊢ ((((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) ∧ 𝑤 ∈ 𝐵) → (𝑤 <s 𝑈 → (𝑤 <s 𝑈 ∧ (𝑤‘dom 𝑇) = 1_o)))
67	66	reximdva 3166	. . . 4 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → (∃𝑤 ∈ 𝐵 𝑤 <s 𝑈 → ∃𝑤 ∈ 𝐵 (𝑤 <s 𝑈 ∧ (𝑤‘dom 𝑇) = 1_o)))
68	38, 67	mpd 15	. . 3 ⊢ (((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) ∧ (𝑈‘dom 𝑇) = ∅) → ∃𝑤 ∈ 𝐵 (𝑤 <s 𝑈 ∧ (𝑤‘dom 𝑇) = 1_o))
69	25, 68	mtand 816	. 2 ⊢ ((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) → ¬ (𝑈‘dom 𝑇) = ∅)
70	69	neqned 2945	1 ⊢ ((¬ ∃𝑥 ∈ 𝐵 ∀𝑦 ∈ 𝐵 ¬ 𝑦 <s 𝑥 ∧ (𝐵 ⊆ No ∧ 𝐵 ∈ 𝑉) ∧ (𝑈 ∈ 𝐵 ∧ (𝑈 ↾ dom 𝑇) = 𝑇)) → (𝑈‘dom 𝑇) ≠ ∅)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 395 ∧ w3a 1086 = wceq 1537 ∈ wcel 2106 {cab 2712 ≠ wne 2938 ∀wral 3059 ∃wrex 3068 ∪ cun 3961 ⊆ wss 3963 ∅c0 4339 ifcif 4531 {csn 4631 ⟨cop 4637 class class class wbr 5148 ↦ cmpt 5231 Or wor 5596 dom cdm 5689 ↾ cres 5691 Oncon0 6386 suc csuc 6388 ℩cio 6514 ‘cfv 6563 ℩crio 7387 1_oc1o 8498 No csur 27699 <s cslt 27700

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-tp 4636 df-op 4638 df-uni 4913 df-int 4952 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-ord 6389 df-on 6390 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-fo 6569 df-fv 6571 df-riota 7388 df-1o 8505 df-2o 8506 df-no 27702 df-slt 27703 df-bday 27704

This theorem is referenced by: noinfbnd1lem5 27787 noinfbnd1lem6 27788

W3C validator